Toothbrushes are probably too soft, but give it a try! I am thinking of the black brush you got. It usually is three brushes you get in those kits, one plastic, one brass and one steel. I start with the plastic brush, and if that isn't enough I use the brass one. After I use the brass one I go back to the plastic to give it a final polish. I could put up a how-to on my blog if there is interest.